A_FaceTarget is an action that immediately changes the actor's angle to be facing its target. If the actor doesn't have a target however, this action will do nothing. In SRB2, this is frequently used by a number of Objects and other actions.
Code – A_FaceTarget
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// Function: A_FaceTarget
//
// Description: Immediately turn to face towards your target.
//
// var1 = unused
// var2 = unused
//
void A_FaceTarget(mobj_t *actor)
{
#ifdef HAVE_BLUA
if (LUA_CallAction("A_FaceTarget", actor))
return;
#endif
if (!actor->target)
return;
actor->angle = R_PointToAngle2(actor->x, actor->y, actor->target->x, actor->target->y);
}
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